Bolt-lock.



EENES'r E. ELLMANN, or ST. LOUIS, msSdUEI, ASsIGNoE-.oE Emmy-ONEONE-HUN-v DEEDTES 'ro CLARENCE D. JOHNSON, or

sTATEs PATENT onirica.v

BOLT-LOCK.

S'r. LoU`1S, MISSOURI;

Speeication of Letters Patent. lPatented July 23, 1912, Application ledSveptember 15,1911. Serial No. 649,451.l

To @ZIE/whomf t may concern.:` Be it known that I, ERNEST E. ELLMA'NN acitizen ofthe United States, and resident of St. Louis, Missouri,haveinvented certain |new and useful Improvements in B olteLoc'ks,

of which the following is a Vspecification 'containing a full, clear,and exact descrip-r tion, reference being had to the accompany ingdrawings, forming a parthereof. My invention relateSt-'o improvements 1nbolt locks, and the object of my invention-is to construct a simple,inexpensi've'and eicient m'eans to prevent bolts from turning.

With the above vpurpose 1n,v1 ew my 1nvention consists 1n certain novelfeatures of construction and arrangement of parts as rail joint.

provided with. a right hand thread 2. At

the opposite end of the bolt there is the ordinary bolt head 3. At thebase of the .body

Vof the bolt 1 next adjacent the head 3 ,there is an4 angular,projecting shoulder 4. Formed integral with the threaded end of theboltA there, is a reduced `portion-5 having thereon a left hand thread.

6 designates an ordinary nut which is provided with an internal righthand thread to-be secured over the bolt upon the right ^hand threads 2.

7 designates'a jam nut-having anlopening therethrough of ldiffer/entdiameters, the larger portion of which is of approximatel`y the samediameter as the `diameter of the body portion ofv the bolt so that thejam nut 7 may be moved over the threads 2. The

internalleft hand threads.

8 designates myjmproved locking Washer which consists of an angularpiece of spring steel, preferably rectangular, which -is longitudinallycurved so that its end margins will engage lin theI work and if usedupon kwooden Structures embed in thevwork with sutlicient bite toprevent turning l of the \,washer. Located in the approximate center ofthe washer there isan opening 9 Shaped to conform with the angularshoulder 4 upon the inside face of the bolt'head.,

f In Fig. 4 I illust-rate va number of the VWashers as applied toavnumber of alining.

bolts, 'the washers interengaging 'at their end margins VKso as to beprevented from V .65 be observedthat the shoulder 4'is i turning. e

It is to of less thickness than'the thickness of the washer so that, ifthe bolt is drawn in a poi.

sition to completely flatten` outthe Washer,

. the'sho'ulder 4 will not engage the work.

I claim: In combination with a bolt having a portion, adjacent its head,non-circular in cross portion of least diameter is provided with' z I. n

section, an elastic metallic Washer having a non-circular opening andtwo opposing marginsgof the washer lying in planes removed from theplane of the opening. i

In testimony whereof, I have signed my name to this specification, 'inpresencey of two. subscribingl witnesses.

ERNEST E. ELLMANN. Witnesses:

E. L. WALLACE, N. G. BUTLER. f

